How Can I Parse Manually `multipart/form-data` in PHP for PUT Requests?

Manually Parsing Multipart/Form-Data in PHP for PUT Requests

Parsing raw multipart/form-data data in PHP can be challenging, especially for PUT requests. PHP's built-in parser automatically handles POST requests but not PUT.

Background:

Multipart/form-data is a format used to encapsulate multiple data parts, including fields and files, within a single request body. The data is separated by boundary strings, and each part has its content type and name.

Manual Parsing:

To manually parse multipart/form-data, you can use the following steps:

1. Retrieve the raw request data: $input = file_get_contents('php://input');
2. Extract the boundary: preg_match('/boundary=(.*)$/', $_SERVER['CONTENT_TYPE'], $matches);
3. Split the data into blocks based on the boundary: $a_blocks = preg_split("/- $boundary/", $input);

4. For each block:

   • For file fields (containing "application/octet-stream"):

     • Extract the field name and file contents: preg_match('/name="([^"]*)".*stream[n|r] ([^nr].*)?$/s', $block, $matches);

   • For other fields:

     • Extract the field name and value: preg_match('/name="([^"]*)"[n|r] ([^nr].*)?r$/s', $block, $matches);
5. Assign the field and value to a data structure: $a_data[$matches[1]] = $matches[2];

Example Usage:

<code class="php">$a_data = array();
parse_raw_http_request($a_data);
var_dump($a_data);</code>

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